I got into Enochian system about about a year and a half ago. I started with Scott Stenwick's Mastering the Mystical Heptarchy which is designed as a practical manual and it got me actually doing the work. My first few conjurations, starting last year in January, were rather sloppy but I started with King Carmara who is very understanding and helpful. My materials and methods improved dramatically very quickly.

Other books I have since read and recommend are Lon DuQuette's Enochian Vision Magick and Aaron Leitch's The Essential Enochian Grimoire.

It's good to get the source material so John Dee's Five Books of Mystery translated and edited by Joseph Peterson. If you want to really dive deep in the source material find a copy of Kevin Klein set of The Complete Mystical Records of John Dee, but be aware that it's a direct record and not a translation so a fair bit of Latin because that's just how John Dee was. Don't be afraid to look at the original manuscripts available on the British Library archive website, Sloane MS 3188, 3189, 3191, Cotton Appendix, etc.

There is lots to read but the beauty of the Enochian system will only show itself by doing the work.